RU1800967C - Method for measuring time parameters of induced muscular contraction and device to embody it - Google Patents

Abstract

Use: in medicine, for diagnosing the functional state of the peripheral part of the neuromuscular apparatus. SUMMARY OF THE INVENTION: in order to increase the accuracy of determining the latent period of muscle contraction and the time of its contraction, a rectangular electric pulse is applied to the muscle, the acoustic emission signal from the muscle being studied is recorded, the period of time from the leading edge of the electric pulse to the beginning of the muscle reaction and from the beginning of the reaction of the muscle to the end, wherein the beginning of the reaction of the muscle is determined by the leading edge of the acoustic emission signal, and the end by its trailing edge. 2 s.p. f-ly, 1 ill.

Description

The invention relates to the field of applied medicine and can be used in the diagnosis of the functional state of the peripheral part of the neuromuscular apparatus (NMD).

The purpose of the invention is to increase the accuracy of determining the latent period of muscle contraction (LPSM) and the time of its contraction (SCM),

The drawing shows the amplitude-time acoustogram of the caused muscle contraction. V

The method is carried out as follows.

 Electrodes (stimulating and indifferent) and an acoustic emission sensor are applied to the skin. Immediately after that, a single electric pulse of 1 rectangular shape of supremaximal force is applied to the test muscle and the muscle response is recorded in the form of acoustic emission signals. In this case, the latent period of muscle contraction of TLP is measured as the time period from the moment of applying the electric pulse recorded by it leading edge 2, before muscle contraction begins, recorded along the leading edge 3 of the acoustic emission signal. The end of muscle contraction is recorded at the trailing edge 4 of the acoustic emission signal, and the time of contraction of muscle That is defined as the period of time between the leading 3 and trailing 4 edges of the acoustic emission signal.

Example. The functional state of intramuscular athletes in the process was determined

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training. The hardware equipment included: a device for recording acoustic emission signals, consisting of an ESU-2 electric stimulator, an IPR-01 sequential reaction meter and an acoustic emission signal sensor in the form of a modified M-1 electret microphone, and an ergometer for creating dosed loads, which is an inclined plane with a carriage moving along it and a rigid footrest. Stimulation of the motor points of the studied muscles was brought about using active and indifferent electrodes. Preliminary testing of athletes was carried out with single pulses of rectangular shape 1 cm long. The voltage of the threshold muscle contraction and the evoked acoustic emission signal were recorded for the duration of the latent period of muscle contraction and the time of its contraction, then every 10 in an increasing irritating stimulus, up to the supramaximal one the duration of the measured periods has stabilized.

Subsequently, a single pulse of a rectangular shape of supramaximal force was applied to the athlete’s muscle under study. Athletes performed a series of dosed loads on an ergometer with rest pauses between attempts and series of attempts. Each series of attempts (loads) consisted of 12 bending of an athlete sitting on a carriage with pushing the legs up from the stop along an inclined plane. Each athlete completed 10 series of attempts. Testing of the state of NMD was carried out during pauses between series. Testing showed that with the athlete's fatigue, the carriage speed decreased from 5.3 to 3.6 m / s, the latency period increased from 5.2 to 6.6 m / s, and the muscle contraction time from 70 to 90 ms.

The proposed method for determining the temporal parameters of induced muscle contraction by recording acoustic emission signals from the muscle under study when exposed to it with a single electric pulse allows to obtain

accurate real-time data reflecting the functional state of the contractile structures of peripheral NMD at the level of the whole organism. Simplicity and short time (no more than 2-2.5

min) measurements, processing and interpretation of the obtained characteristics of the state of the NMD allow using the proposed method in the training process to correct the loads on the athlete.

Claims (2)

1. A method of measuring temporal parameters caused by muscle contraction, including the impact on the muscle with a rectangular night electric pulse, recording the muscle response, measuring the period of time from the leading edge of the electric pulse to the beginning of the muscle reaction and from the beginning to the end of the muscle reaction, characterized in that, in order to improve the accuracy of determining the latent period of muscle contraction and the time of its contraction, the acoustic emission signal from the studied muscle is recorded and the beginning of the muscle reaction is determined by the leading edge of the acoustic emission signal, and the ending is along its trailing edge to the front. 2. A device for measuring the temporal parameters of a caused muscle contraction, containing electrodes connected to a stimulator, a sensor associated with registrar, ex. which means that, in order to increase the accuracy of determining the latent period of muscle contraction and the time of muscle contraction, the sensor is made in the form of an electret microphone; placed in a sealed capsule, the working side of which is equipped with an elastic membrane.